CI: cherry-pick shell:bash + OS-split test filename convention from PR 820

.github/workflows/ci.yml

@@ -101,6 +101,19 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Run per-addon unit tests
+        # Filename convention (all OSes):
+        #   test_*.py              — general (any OS)
+        #   test_linux_*.py        — Linux-only
+        #   test_windows_*.py      — Windows-only
+        #   test_integration_*.py  — Linux-only, full-pipeline/DB-backed
+        # The Linux job runs test_*.py except the Windows-only and
+        # integration buckets. Integration tests run in their own job.
+        #
+        # shell: bash — the container's default shell is /bin/sh
+        # (dash on python:3.12-slim), which does not support the
+        # ${var//pattern/repl} and ${var%.py} parameter expansions
+        # used below. Falls silently under continue-on-error.
+        shell: bash
         env:
           PYTHONPATH: .
         run: |
@@ -109,6 +122,7 @@ jobs:
             [ -f "$f" ] || continue
             case "$(basename "$f")" in
               test_integration*) continue ;;
+              test_windows_*)    continue ;;
             esac
             case "$f" in
               Sqlite/tests/test_sqlite.py) continue ;;
@@ -153,6 +167,8 @@ jobs:
           python -c "import gramps, gi; print('deps OK')"
 
       - name: Run per-addon unit tests
+        # See filename-convention note in unit-test-linux. The Windows
+        # job runs test_*.py except test_linux_* and test_integration_*.
         env:
           PYTHONPATH: .
         run: |
@@ -161,6 +177,7 @@ jobs:
             [ -f "$f" ] || continue
             case "$(basename "$f")" in
               test_integration*) continue ;;
+              test_linux_*)      continue ;;
             esac
             case "$f" in
               Sqlite/tests/test_sqlite.py) continue ;;
@@ -190,11 +207,19 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Run plugin registration tests
+        # shell: bash for consistency with the surrounding steps; the
+        # current command uses no bashisms, but keeps this block safe
+        # against future edits. Container default is /bin/sh → dash.
+        shell: bash
         env:
           PYTHONPATH: .
         run: python3 -m unittest discover -s tests -p "test_*.py" -t . -v
 
       - name: Run per-addon integration tests
+        # shell: bash — see unit-test-linux for rationale; the
+        # ${var//pattern/repl} and ${var%.py} expansions below are
+        # bash-only.
+        shell: bash
         env:
           PYTHONPATH: .
         run: |